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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b3c46dc32a2aa15aa158bf10a89182321f53071dc901e4a62c31ac126a60a77' 
  AND token = 'Uh7EG845GGXixsg3Ln/tT/WmEz64OtYbDbEXae7W6ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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