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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eecc2b17b1bcf98e2bc57c65318a765224b87357f0c4e3866e56a47e510e9e7b' 
  AND token = 'cMqmFFA6w/4/NmKQiwLcDPmZsPAA22gQN9V77EZDbrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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