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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd56f98d7a0b27986fe05f5baa1d9bb22779fad6c598eb6b8f8e1761aaf5dfcf' 
  AND token = 'M0vGVEAJtRhx0pCxgb0uLU8mImqFNeo+zTszX0RJdU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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