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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49bb3e1ad58a8a51bb1dd21c28487478d8835acd392d5838f88336a1a0ff5d2f' 
  AND token = 'ohSeI6yOM2nebps3J+R+QKNZfJv9Zw1kp/L7y8X5Gm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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