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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cfb85143125c53074220a8988908e4112839cbaec536373e2894289db462389' 
  AND token = 'b1mDXqW2XoNV5ZnPBob6iY6760K0equi8l4w9aag7Dc=' 
  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"
    }
  }
}