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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90bac79c048a6ba8c585c4d1bb3f93e894a1140f7c3b0d7b239f90e8b11df28' 
  AND token = 'xGSxBftmxgkJZyVzKICbCcZBzT0EIne7JxbuWW0/Rps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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