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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c433bcfa4f12f8a9dea2e9145a40e70955dd69cabc4c5c0dacbe812d3f95a7a8' 
  AND token = '0V96fy9BirunPcJ+O9vHJtSdrbJjYfkJfc+YgWdixg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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