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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a0207c3b3437f3003990d63a66bc3e4db751294833ea7a76086d714c1f065c' 
  AND token = 'gOZG26lAUC8lPv12rPUSHFp07+gGVk4hkSHxJRakyVs=' 
  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"
    }
  }
}