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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '107518565fcd094a39cecdb0bdfebfc644c4aa47ba7a029192d7a1ec63ca0eb4' 
  AND token = 'kdoA4m+Ivu1ZZSny8+hRKbzUBNgMgf1LPzn/HXncm6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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