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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdf10a7a8aa790864f9e62f830d01413dc33b15ad10cc512457b6b0639c6d5e' 
  AND token = 'bs+h0u2ZEdn7WNpEDEBenexdJT96mL14/VvAK/yCX38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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