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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905c705e16a8b164da60f97894b81c3517f5226e8ee0b62718d2f46273bee16a' 
  AND token = 'M4NVeoHvRNJG7BStRfoPuLuNzm0rmHQJIyJPn2io49Q=' 
  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"
    }
  }
}