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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a65f5ab2e304a1d2901cdad9fda7b244e9a0b1b7f6a0d2369af6645be57609e' 
  AND token = 'rXAU4ocWHnYSMRi4yy2z3or5OdjZE4Hg0moCMRLZrQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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