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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b48eef8e24430f6106f7601a7885f2793492fdace1ee64505f6904d8ba86750' 
  AND token = 'k85OFDYDOJs3+Fs6bIgnfaB3py7HLt+XUKAgyLaB5yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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