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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb16ac8b4f8715b4c47b2fb962bf38b72e19fdf01f0388629f28d511e0df9a5e' 
  AND token = '7rWOUgXSK290/H4Myal5PDsLgLZav2TePdGYXxDeb54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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