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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5cede03ce40bb98122b20a39475a0be509bfcc3a9e92c3626182888ef54a52c' 
  AND token = 'fGPw9aRT6+cG4znyoYznGgepeDIYa0xYs5Foc5p+yx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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