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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7767a3470efce6d56468b005b308d5a9f2676e8abaa03dc928b4b075061613fb' 
  AND token = '2fSo2zOFe/4cp/sycBmOerL9rSx1Pk4/0JcCg4PTSqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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