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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10c23b03f5cd1130d1f89fb9ab902f0d8e8a99720c8b7203659c398ce96318c' 
  AND token = '1ROkqCwQJs1oUYqKFOJOVwvuphlViq3bPKL9tKIVjkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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