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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819207421f361adcb1039a80a5b154f35486b578cc6acd25dd3011535b26311e' 
  AND token = '3jdK5B+C3TI/1K+Dam7go3Ja5e/Ffcycq6JfOq944+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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