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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e4e658a47db8d1cab3d34e74fc029d7049b27d04af6c6c96678f74e3fe94cf' 
  AND token = '3T8mVXebFCOaSGESAzKgVgj5Dl8Bg/zReRxCppbk6iY=' 
  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"
    }
  }
}