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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e5d1dab60e13693e678ce6ceef49ca39d818c22b2e6a7b0c8b8bfc9cff3050' 
  AND token = 'Rew8mZL1bdApZevpUoBuyy6v0nc/BZr6ttfoNR8Y5Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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