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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c026c4e2b1448fa08d4b7fdf1e837b1239b052f82595573c42967b20333fcac' 
  AND token = '2551GSHrg7cgZk0UA8c/eKHCbjmg0wD89AU+D4wZ0OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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