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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deceedd2fe4b292019132c0f4c4f24b728a12a7fdac2254a98ce201e37ec6d29' 
  AND token = 'mDS8i62juVgvexAOto8H74J2aPA0AqPyw5gYkzKhD0o=' 
  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"
    }
  }
}