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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b401a0df81771349f91d653e1c0ae0070e7377560ec0cb31fe1acba36e0b79' 
  AND token = 'tqlvnvzbwxYiN/RiuzO9xaPGDrwd9jg2OEPhPClFuTY=' 
  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"
    }
  }
}