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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ecebb969b236703d26eb6ed97535f4f4b4febf69fe479d81b1d3fb431e8d99' 
  AND token = '4GVkbdQqUp3sDLVWoiHcveaGVQGunlaFETV6vPGauEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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