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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd040aa8da7852ac68832cb2debae7eb825dfdb3238bd20f4a439eb3a5b0f9caf' 
  AND token = 'WRiAf6e4/iVv14jD7ACs3kFKY7ZFA9U6JF1F9xJZ0Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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