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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369ebcf21688de8df9143d7aba8156973b1a1db898ae590e8ff3538d5b71ff1f' 
  AND token = 'i7l01a7LxD3omTsW5KSi4Inlh+l2l0a1ZpTyyVHzCZk=' 
  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"
    }
  }
}