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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b12c3ea8de50756f65ce6fb4c0d8b5ebae441333c128cfcdf178768b05b752' 
  AND token = 'hUQsaFaFSPigaOo9enq5QqOxOX82OVev82zU5Ucy1i0=' 
  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"
    }
  }
}