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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bca284c967feb94cc99080234254d4f6717673c02afc115ad3df9f40646928' 
  AND token = 'CT7SGtO1bbTi/N0drQabkwmjA87fE2EOWt3FbDi3b8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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