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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311367fa0e1d6202602e1bc5bda1c2578174a845a4e1c8215f8d70ad6002571c' 
  AND token = 'JpwuBxQxAQUARtueoEdxacw/JI2baIHq2rWQD2SL9Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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