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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841f71a3e15f2d825eeaaf8cb15db81469e1f8cb3e9450820f1bc011c8d442c4' 
  AND token = 'HbrPMBiSKYxkqU2tw5AJU8X+tBAUHYBz76I8r63c5rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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