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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4d79f125d38d6874edec996ab0cabbc70868df1bc2e652ac773ee658b01d47' 
  AND token = 'rW+xcpeMS/u+mQuR/wtKcnGAvPffkjeXX33dMSyJwzc=' 
  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"
    }
  }
}