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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228c908351e2b19f380d52e7eb7620b4fb384e37cc5b2466c6e4bbfa321f2950' 
  AND token = 'zAq3gnKeMInVAUI7IgIST0ygiPoYfC3R1ee7DFtMCKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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