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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c14914384c5ba87fc7e232129e3085d08dd5d3e37a337c9de1bf58fdea0a59' 
  AND token = '7uoEohPqbTEhR2RbJaWfulznhG4niGJAiwulJpwaxkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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