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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2473fed224fe847daf11148116ac3ab6e2f4e334b8751344ad70c3125cf60b9' 
  AND token = 'WUJ2exEoQ1Vtk1zm7eWqtlo6oBkpME5JkNY5mB3UELE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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