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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35102b5fa8aec2e396cf93a3869058e00ffba6aa4aa9c4355c5b2c6ff6073e80' 
  AND token = '+rGZJpSBzzDn+M0tiOTWYi1RHWwY9SEuI5tmv0/ycL0=' 
  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"
    }
  }
}