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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e14ada9130b97ccc6e120a2fde2550af97a9413dec03b5f50082f6a06d3a4fd' 
  AND token = 'KMhN4fKapGUHuklvMStolEB8Oen5TVTm0kyHBvc2YvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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