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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07469ecf3a1ae910bdc891878cd2476fe17c4af553aa7d30385b8409a52002e5' 
  AND token = '6S5QsEeChQ1/fb8Ij4S9bRbjW1gPSGewFoo2dSCW/GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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