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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e66630b00dff0ec5119841a19c22c4d23c26629bcae461266efdd5e4b829d04' 
  AND token = 'W/nTKrjFrqUM5clPLW3cWniQ+4S4a8XjtD+l/TJoGO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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