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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe24f090c95696ce1fa2d0878c6d0c8bca0bed6cd547dec4cf55f93fd8c0c5b' 
  AND token = '6h/K4FDCdkwpwHnt45FrzPOOsM7/QdbKWFq3fn53aCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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