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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '459f1c061987b7a4aa8d13046205cbd992993f6e9e7ab95a75f69c4c39f1cf84' 
  AND token = 'Bobcbkhon1t1nCV2D3sSgnG4DNgpmG7UWAYf97G0S+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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