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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666ffe5858b1d667f90daf99bb8a0496fa9d6e30ae6b80f733068d5bc744ab80' 
  AND token = 'Tr9V7duNcn3Vtc1z8KrGWtePftybT1TuAckkJP1j3GE=' 
  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"
    }
  }
}