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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd882c534659e8d8305e1026b0632cba9745fb815117e3c01b8ee4a5f8f509b1b' 
  AND token = 'cqLwWVvJdOpXuPADk9brxNY09ze905bK8YyGmGfWYws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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