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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f11ec31010b0413ae32134773f71be670bbeb2f5a7791ff743123086e242fc' 
  AND token = 'TzL3sfAxEvx5MIxj3+iLu9nB2fk6QOaD5kMC468DVcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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