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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8effdc7b62ffd92ce84d961a011baeefb2391c5ea94c4b7216d10b0ffe9f202' 
  AND token = 'JLm9fs+kK96J7AYVF2B+0oX1uP3rU2j0ygJhoGJBYoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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