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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f83124f91b489a1cb4e332a794623477f4b045f19d9d0fd1a9fa8b9c9e83901' 
  AND token = 'p29iSlviiCyo0XzBdAy2c6vdZ+1HuhOeA6/W34N6BJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}